I'm from Brasil and I don't speak English very well - sorry. I made some GUI Input and would like 4 of these GUI Input accept only letters - not numbers (uppercase letters = A,B,C,D,..,Z) - Something like $ES_LETTERS instead of $ES_NUMBER. What I have to do? Tried Search and Google a lot and nothing.... Thanks for all. $LinhaINPUT = GUICtrlCreateInput("3", 107, 30, 25, 21, BitOR($ES_CENTER,$ES_NUMBER)) ; THIS ACCEPT ONLY 1 NUMBER $OrdemINPUT = GUICtrlCreateInput("B", 235, 62, 25, 21, BitOR($ES_CENTER,$ES_UPPERCASE)) ; THIS MUST ACCEPT ONLY 1 LETTER (A,B,C,...,Z) GUICtrlSetLimit(-1, 1) $HistoricoINPUT = GUICtrlCreateInput("H", 171, 94, 25, 21, BitOR($ES_CENTER,$ES_UPPERCASE)) ; THIS MUST ACCEPT ONLY 1 LETTER (A,B,C,...,Z) GUICtrlSetLimit(-1, 1) $StatusOrdemINPUT = GUICtrlCreateInput("F", 219, 126, 25, 21, BitOR($ES_CENTER,$ES_UPPERCASE)) ; THIS MUST ACCEPT ONLY 1 LETTER (A,B,C,...,Z) GUICtrlSetLimit(-1, 1) $StatusDetalhadoINPUT = GUICtrlCreateInput("G", 219, 158, 25, 21, BitOR($ES_CENTER,$ES_UPPERCASE)) ; THIS MUST ACCEPT ONLY 1 LETTER (A,B,C,...,Z) GUICtrlSetLimit(-1, 1) $PastaTrabalhoINPUT = GUICtrlCreateInput("INSTRUMENTACAO", 203, 190, 206, 21) $CaminhoPlanilhaINPUT = GUICtrlCreateInput("", 24, 224, 385, 21)